On my site, NitroHack, one of my users, Micro-Mario64, has CSS in his Signature.I can't activate/deactivate CSS, only BBCode and HTML can be.How do I activate it so his signature appears correctly?

From Luigi442wii(Please join NitroHack if you like - it's a Nintendo hacking forum, although no one has posted them. Actually... I will add a new rule to the board that no full ROMs can be distributed there.)